I often see LED types categorized according to their brightness ratings. Are the ultra-bright and super-bright types always focussed to achieve their extra brightness or does it depend on the material and manufacturing technology other than focussing? Are there diffused but extra bright types?
The ratings seem more like marketing hype IMO. I usually choose based on mcd or lumens and the angle I want to cover - preferably with a chart to show the half-power points not just the "degrees" the manufacturer claims. From there I assume that they will put out at least half their specified brightness at a reasonable current. Ultra bright and super bright are just subjective marketeering hyperbole, along with the "life expectancy."
There are diffused "extra" (another subjective meaningless adjective) bright types.
One would think that will all the potential market for these things for general lighting applications, that they'd adhere to the same testing and specification standard. Then we have bin numbers, color grading schemes and ebay.....
On Oct 26, 8:08=A0am, default wrote: > The ratings seem more like marketing hype IMO. =A0I usually choose based > on mcd or lumens and the angle I want to cover - preferably with a > chart to show the half-power points not just the "degrees" the > manufacturer claims. =A0From there I assume that they will put out at > least half their specified brightness at a reasonable current. =A0Ultra > bright and super bright are just subjective marketeering hyperbole, > along with the "life expectancy." >
No it's not. Iused old red LEDs years ago that were dim with 10 mA. I bought some high brightness LEDs a few weeks back that are VERY bright running 350 uA.
Quite a few years back we needed very fast turn on/off times on LEDs and the HP high brightness LEDs were 10 nS. We used it for test signals up to 30 MHz to test photo sensors and preamps for HDTV film scanner.
I bought a few (1 watt) orange and white LEDs on ebay awhile back. The brightness is more than I can look at directly. One on the white (1 watt) versions lights up my living room at night, so I can walk around the room with no other light. They also work well at low power of a few milliamps, so you can use them either way, low or high power. They draw about 300mA at 2 to 3 volts. The cost was about $1 each.
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